In the beginning of time, there was God - - - creator of life. By their hand, Earth and Heaven came into existence. The first mortals came to being, Adam and Eve, God's most treasured creations. They were the only beings granted free will.
But while this was his most generous gift, it along become his greatest mistake.
God tasked Lucifer with testing the mortals by temptation. Needless to say, the test was failed - - - Adam and Eve had sinned. Convinced that their children and their children's children and onward would succumb to sin, God granted unto Lucifer and other archangels and seraphim with an eternal task: test the will of mortals by temptation and grant punishment on those whose souls cannot be saved.
With this, Hell and Satan were born. Until the end of time itself, mortals will be tested until their demise. And when they do perish, they will receive divine judgement.
...Unless there is one who can finally bring salvation to all.